Пункты выдачи с доступными товарами

event.php

<?php

use Bitrix\Main;
use Bitrix\Sale;
use Bitrix\Catalog;

$eventManager = Main\EventManager::getInstance();

$eventManager->addEventHandler('sale', 'onSaleDeliveryServiceCalculate', function(Main\Event $event) {
	/** @var Sale\Delivery\CalculationResult $calculationResult */
	/** @var Sale\Shipment $shipment */
	/** @var Sale\Order $order */
	$calculationResult = $event->getParameter('RESULT');
	$shipment = $event->getParameter('SHIPMENT');
	$deliveryId = (int)$event->getParameter('DELIVERY_ID');
	$order = $shipment->getOrder();

	if ($order === null || $deliveryId <= 0 || mb_strpos((string)$order->getField('XML_ID'), 'YAMARKET_') !== 0) { return; }

	$deliveryService = Sale\Delivery\Services\Manager::getById($deliveryId);
	$deliveryStores = Sale\Delivery\ExtraServices\Manager::getStoresList($deliveryId);
	$basketQuantities = [];

	/** @var Sale\ShipmentItem $shipmentItem */
	foreach ($shipment->getShipmentItemCollection() as $shipmentItem)
	{
		$basketItem = $shipmentItem->getBasketItem();

		if ($basketItem === null || $basketItem->getQuantity() <= 0) { continue; }

		$productId = (int)$basketItem->getProductId();

		if (!isset($basketQuantities[$productId])) { $basketQuantities[$productId] = 0; }

		$basketQuantities[$productId] += (float)$basketItem->getQuantity();
	}

	if (!$deliveryService || empty($deliveryStores) || empty($basketQuantities) || !Main\Loader::includeModule('catalog')) { return; }

	$storeQuantities = [];

	$queryStoreAmounts = Catalog\StoreProductTable::getList([
		'filter' => [
			'=PRODUCT_ID' => array_keys($basketQuantities),
			'=STORE_ID' => $deliveryStores,
		],
		'select' => [ 'PRODUCT_ID', 'STORE_ID', 'AMOUNT' ],
	]);

	while ($storeAmount = $queryStoreAmounts->fetch())
	{
		if (!isset($storeQuantities[$storeAmount['STORE_ID']])) { $storeQuantities[$storeAmount['STORE_ID']] = []; }
		if (!isset($storeQuantities[$storeAmount['STORE_ID']][$storeAmount['PRODUCT_ID']])) { $storeQuantities[$storeAmount['STORE_ID']][$storeAmount['PRODUCT_ID']] = 0; }

		$storeQuantities[$storeAmount['STORE_ID']][$storeAmount['PRODUCT_ID']] += (float)$storeAmount['AMOUNT'];
	}

	$storesAvailability = [];

	foreach ($deliveryStores as $storeId)
	{
		$isAvailable = true;

		foreach ($basketQuantities as $productId => $quantity)
		{
			$storeQuantity = $storeQuantities[$storeId][$productId] ?? 0;

			if ($storeQuantity < $quantity)
			{
				$isAvailable = false;
				break;
			}
		}

		$storesAvailability[$storeId] = $isAvailable;
	}

	$calculationData = (array)$calculationResult->getData();
	$calculationData['MARKET_STORES'] = array_keys(array_intersect($storesAvailability, [
		mb_stripos($deliveryService['NAME'], 'под заказ') === false,
	]));

	$calculationResult->setData($calculationData);
});